Piston ring



May 18, 1937. sc u 2,080,579

PISTON RING Filed Sept. 17, 1935 Patented May 18, .1937

UNITED STATES PATENT OFFICE PISTON RING Thomas Sohaub, Philadelphia, Pa. Application September 1'1, 1935, Serial No. 40,872 1 Claim- (Ol. 309-44) The object of my invention is to devise a. novel piston ring for the pistons of internal combustion engines which can be used both as an oil rin and as a gas ring to effectively seal the space between the piston and its cylinder.

With the above and other objects in view as will hereinafter appear, my invention comprehends a novel piston ring.

It further comprehends a novel piston ring comprising an inner and an outer split ring, and

wherein the inner ring does not contact with the wall of the cylinder but serves to move the outer ring towards the cylinder wall and towards the upper wall of the piston groove in which it is located.

Other novel features of construction and advantage will hereinafter more clearly appear in the detailed description and the appended claims.

For the purpose of illustrating the invention,

I have shown in the accompanying drawing a typical embodiment of it, which, in practice, will give satisfactory and reliable results. It is, however, to be understood that the various instrumentalities of which my invention consists can a be variously arranged and organized, and my invention is not limited to the exact arrangement and organization of these instrumentalities as herein set forth.

Figure 1 is a top plan view of a conventional 3 piston, in conjunction with which my novel piston ring is used.

Figure 2 is an elevation of a piston and the piston rings, the view being partly broken away to more clearly illustrate the construction.

Figure 3 is a cross section of the outer ring, lfi detached position.

Figure 4 is a cross section of the inner ring, in detached position.

Figure 5 is an enlarged section showing the 40 parts in their relative positions.

Figure 6 is an enlarged section similar to Figure 5 but showing the ring sections assembled in a reverse position to that seen in Figure 5.

Similar numerals indicate corresponding parts.

Referring to the drawing:

I designates a piston of any desired or conventional construction having annular grooves 2 to receive the piston rings.

The composite piston ring of my present in- 50 vention comprises an outer split ring 3 and an inner split ring 4. The outer ring has an outer vertical wall 5, a top'wall 8, a bottom wall 1 and an inner inclined wall 8. The inner ring has an inner vertical wall 9, a bottom wall l0 and an 55 outer inclined wall I I. The inclined walls are not truly diagonal. The inclined wall of the outer I in which the piston is located.

Due to the novel construction of the two rings and the manner in which they. cooperate, it is not necessary to use two different types of rings on the same piston, as the composite ring can be used as an oil ring and -also as a compression ring.

The two rings can be assembled in their piston groo/e as shown in Figure 5 or as shown in Figure The arrangement shown in Figure 6 is preferred as I have found in many cases that this arrangement provides a better seal.

It will now be apparent that I have devised a new and useful piston ring which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in the present instance, shown and described preferred embodiments thereof which will give in practice satisfactory and reliable results, it is to be understood that these embodiments are susceptible to modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention what I claim as new and desire to secure by Letters Patent ls:-

A compound piston ring, comprising an inner split ring and an outer split ring, the outer ring being adapted tohave a close working fit in the piston groove, and the inner ring being designed to be at all times contained in the piston groove and being of less width from top to bottom than the outer ring, said inner ring being triangular in cross section, and having a straight inner wall, a lateral wall and a wall inclining from one edge of thelateral wall to an edge of the straight wall, said outer ring havingparallel top and bottom walls of different lengths, a straight outer wall, and an inclined inner wall, the inclination of said last named inner wall being such as to cause the same to parallel the outer face of the inner ring in all cross sectional planes.

THOMAS SCHAUB. 

